The attack would come because of what Anonymous characterized as a secret meeting to consider a proposal giving the ITU overreaching powers.

Experts say such a proposal, which was brought forward by Russia at the current World Conference on International Telecommunications in Dubai, which the ITU is hosting this week and next, would be virtually impossible to implement.

Many nations, including the United States, would oppose such a decision. Still, Anonymous said the conference could have "grave consequences."

An incident occurred Wednesday when a small group of hackers sent a denial-of-service attack that briefly took an ITU website offline.

Carl Herberger, vice president of security company Radware, told CSO Online that it may have just been a test run.